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  Vuex笔记
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  <h3 id="什么是Vuex"><a href="#什么是Vuex" class="headerlink" title="什么是Vuex"></a>什么是Vuex</h3><p>用于共享、管理状态（数据）的插件</p>
<h3 id="State"><a href="#State" class="headerlink" title="State"></a>State</h3><p><strong>vuex中的“唯一数据源”</strong></p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> &#123; mapState &#125; <span class="keyword">from</span> <span class="string">&#x27;vuex&#x27;</span>;</span><br><span class="line">store = <span class="keyword">new</span> Vuex.Strore(&#123;</span><br><span class="line">    <span class="attr">state</span>:&#123;</span><br><span class="line">        <span class="attr">num</span>:<span class="number">0</span>,</span><br><span class="line">    &#125;</span><br><span class="line">&#125;);</span><br><span class="line">app = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">    <span class="attr">el</span>:<span class="string">&quot;#app&quot;</span>,</span><br><span class="line">    <span class="attr">store</span>:store,</span><br><span class="line">    <span class="attr">data</span>:&#123;</span><br><span class="line">        <span class="comment">// 获取方法1： 直接获取</span></span><br><span class="line">        <span class="attr">num</span>:<span class="built_in">this</span>.$store.state.num;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="attr">computed</span>:&#123;</span><br><span class="line">        <span class="comment">// 获取方式2：利用映射</span></span><br><span class="line">    	...mapState(&#123;</span><br><span class="line">    		<span class="attr">theNum</span>:<span class="function"><span class="params">state</span>=&gt;</span>state.num,</span><br><span class="line">		&#125;)</span><br><span class="line">    	<span class="comment">// 将state中的num映射到组件中，命名为theNum；可以通过直接调用theNum获取Num的值</span></span><br><span class="line">	&#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>



<h3 id="Getter"><a href="#Getter" class="headerlink" title="Getter"></a>Getter</h3><p>对state中的数据，进行操作。类似于vue中的computed</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> &#123; mapGetters &#125; <span class="keyword">from</span> <span class="string">&#x27;vuex&#x27;</span>;</span><br><span class="line">store = <span class="keyword">new</span> Vuex.Strore(&#123;</span><br><span class="line">    <span class="attr">state</span>:&#123;</span><br><span class="line">        <span class="attr">num</span>:<span class="number">0</span>,</span><br><span class="line">    &#125;,</span><br><span class="line">    <span class="attr">getters</span>:&#123;</span><br><span class="line">        <span class="attr">getNum</span>:<span class="function">(<span class="params">state,getters</span>)=&gt;</span>&#123;	<span class="comment">//第一个参数用于获取状态，第二个参数用于调用其他getters方法</span></span><br><span class="line">            <span class="keyword">return</span> <span class="string">&quot;store中的数据num为：&quot;</span>+ state.num;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;);</span><br><span class="line">app = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">    <span class="attr">el</span>:<span class="string">&quot;#app&quot;</span>,</span><br><span class="line">    <span class="attr">store</span>:store,</span><br><span class="line">    <span class="attr">data</span>:&#123;</span><br><span class="line">        <span class="comment">// 获取方法1： 直接获取</span></span><br><span class="line">        <span class="attr">num</span>:<span class="built_in">this</span>.$store.getters.getNum,	<span class="comment">// “store中的数据num为：0”</span></span><br><span class="line">    &#125;</span><br><span class="line">    <span class="attr">computed</span>:&#123;</span><br><span class="line">        <span class="comment">// 获取方式2：利用映射</span></span><br><span class="line">    	...mapGetters(&#123;</span><br><span class="line">    		<span class="attr">theNum</span>:<span class="function"><span class="params">state</span>=&gt;</span>state.num,</span><br><span class="line">		&#125;)</span><br><span class="line">    	<span class="comment">// 将getter中的getNum映射到组件中，命名为theNum；可以通过直接调用theNum获取字符串的值</span></span><br><span class="line">	&#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>



<h3 id="Mutation"><a href="#Mutation" class="headerlink" title="Mutation"></a>Mutation</h3><p>用于<strong>同步修改“状态”</strong>。类似于事件，需要提交事件之后，会得到一定响应。</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> &#123; mapGetters &#125; <span class="keyword">from</span> <span class="string">&#x27;vuex&#x27;</span>;</span><br><span class="line">store = <span class="keyword">new</span> Vuex.Strore(&#123;</span><br><span class="line">    <span class="attr">state</span>:&#123;</span><br><span class="line">        <span class="attr">num</span>:<span class="number">0</span>,</span><br><span class="line">    &#125;,</span><br><span class="line">    <span class="attr">mutations</span>:&#123;</span><br><span class="line">        <span class="attr">increment</span>:<span class="function"><span class="params">state</span>=&gt;</span>&#123;</span><br><span class="line">            state.num++;</span><br><span class="line">        &#125;,</span><br><span class="line">        <span class="attr">incrementStep1</span>:<span class="function">(<span class="params">state,step</span>)=&gt;</span>&#123;</span><br><span class="line">            state.num +=step;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="attr">incrementStep2</span>:<span class="function">(<span class="params">state,payload</span>)=&gt;</span>&#123;</span><br><span class="line">            state.num +=payload.step;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;);</span><br><span class="line">app = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">    <span class="attr">el</span>:<span class="string">&quot;#app&quot;</span>,</span><br><span class="line">    <span class="attr">store</span>:store,</span><br><span class="line">    <span class="attr">methods</span>:&#123;</span><br><span class="line">        <span class="attr">incrementHandle</span>:<span class="function"><span class="params">state</span>=&gt;</span>&#123;</span><br><span class="line">            <span class="comment">// 使用方法1：非对象提交</span></span><br><span class="line">            <span class="comment">// 不带参数：</span></span><br><span class="line">            <span class="built_in">this</span>.$store.commit(<span class="string">&#x27;increment&#x27;</span>);</span><br><span class="line">            <span class="comment">// 带参数1：</span></span><br><span class="line">            <span class="built_in">this</span>.$store.commit(<span class="string">&#x27;incrementStep1&#x27;</span>,<span class="number">5</span>);</span><br><span class="line">            <span class="comment">// 带参数2：</span></span><br><span class="line">            <span class="built_in">this</span>.$store.commit(&#123;</span><br><span class="line">                <span class="attr">type</span>:<span class="string">&#x27;incrementStep2&#x27;</span>,	<span class="comment">//固定参数，mutation的名字</span></span><br><span class="line">                <span class="attr">step</span>:<span class="number">5</span>,					<span class="comment">//该参数会存在payload对象中</span></span><br><span class="line">            &#125;)</span><br><span class="line">        &#125;，</span><br><span class="line">      <span class="comment">// 使用方法2 利用mapMutations函数映射成组件中的函数</span></span><br><span class="line">        ...mapMutations(&#123;</span><br><span class="line">        	<span class="attr">incrementNum</span>:<span class="string">&#x27;increment&#x27;</span>,	<span class="comment">//可以通过this.incrementNum()来调用</span></span><br><span class="line">    	&#125;)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>

<blockquote>
<p>mutation只能同步修改，即mutation中的操作，不能是异步的</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">store = <span class="keyword">new</span> Vuex.Strore(&#123;</span><br><span class="line">    <span class="attr">state</span>:&#123;</span><br><span class="line">        <span class="attr">num</span>:<span class="number">0</span>,</span><br><span class="line">    &#125;,</span><br><span class="line">    <span class="attr">mutations</span>:&#123;</span><br><span class="line">        <span class="attr">increment</span>:<span class="function"><span class="params">state</span>=&gt;</span>&#123;</span><br><span class="line">            <span class="built_in">setTimeout</span>(<span class="function">()=&gt;</span>&#123;</span><br><span class="line">                state.num++;</span><br><span class="line">            &#125;,<span class="number">1000</span>)</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;);</span><br></pre></td></tr></table></figure>

<p>【会出现视图修改了，但是state中的值未做修改的情况】</p>
<h3 id="Action"><a href="#Action" class="headerlink" title="Action"></a>Action</h3><p><strong>用于异步调用mutation</strong>，达到<strong>异步修改</strong>状态的效果。类似于广播响应。</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> &#123; mapActions &#125;<span class="keyword">from</span> <span class="string">&#x27;vuex&#x27;</span>;</span><br><span class="line">store = <span class="keyword">new</span> Vuex.Strore(&#123;</span><br><span class="line">    <span class="attr">state</span>:&#123;</span><br><span class="line">        <span class="attr">num</span>:<span class="number">0</span>,</span><br><span class="line">    &#125;,</span><br><span class="line">    <span class="attr">mutations</span>:&#123;</span><br><span class="line">        <span class="attr">increment</span>:<span class="function"><span class="params">state</span>=&gt;</span>&#123;</span><br><span class="line">        	state.num++;</span><br><span class="line">        &#125;,</span><br><span class="line">        <span class="attr">incrementStep</span>:<span class="function">(<span class="params">state,step</span>)=&gt;</span>&#123;</span><br><span class="line">            state.num += step</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;,</span><br><span class="line">    <span class="attr">actions</span>:&#123;</span><br><span class="line">        <span class="attr">incrementAsync</span>:<span class="function"><span class="params">context</span>=&gt;</span>&#123;</span><br><span class="line">            <span class="built_in">setTimeout</span>(<span class="function">()=&gt;</span>&#123;</span><br><span class="line">                context.commit(<span class="string">&#x27;increment&#x27;</span>);</span><br><span class="line">            &#125;)</span><br><span class="line">        &#125;,</span><br><span class="line">        <span class="attr">incrementStepAsync</span>:<span class="function">(<span class="params">context,step</span>)=&gt;</span>&#123;</span><br><span class="line">            <span class="built_in">setTimeout</span>(<span class="function">()=&gt;</span>&#123;</span><br><span class="line">                context.commit(<span class="string">&#x27;incrementStep&#x27;</span>,step);</span><br><span class="line">            &#125;)</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;);</span><br><span class="line"></span><br><span class="line">app = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">    <span class="attr">el</span>:<span class="string">&quot;#app&quot;</span>,</span><br><span class="line">    <span class="attr">store</span>:store,</span><br><span class="line">    <span class="attr">methods</span>:&#123;</span><br><span class="line">        <span class="attr">incrementHandle</span>:<span class="function"><span class="params">state</span>=&gt;</span>&#123;</span><br><span class="line">            <span class="comment">// 使用方法1：非对象提交</span></span><br><span class="line">            <span class="comment">// 不带参数：</span></span><br><span class="line">            <span class="built_in">this</span>.$store.dispath(<span class="string">&#x27;incrementAsync&#x27;</span>);</span><br><span class="line">            <span class="comment">// 带参数1：</span></span><br><span class="line">            <span class="built_in">this</span>.$store.dispath(<span class="string">&#x27;incrementStepAsync&#x27;</span>,<span class="number">5</span>);</span><br><span class="line">            <span class="comment">// 带参数2：</span></span><br><span class="line">            <span class="built_in">this</span>.$store.dispath(&#123;</span><br><span class="line">                <span class="attr">type</span>:<span class="string">&#x27;incrementStepAsync&#x27;</span>,	<span class="comment">//固定参数，mutation的名字</span></span><br><span class="line">                <span class="attr">step</span>:<span class="number">5</span>,					<span class="comment">//该参数会存在payload对象中</span></span><br><span class="line">            &#125;)</span><br><span class="line">        &#125;，</span><br><span class="line">      <span class="comment">// 使用方法2 利用mapMutations函数映射成组件中的函数</span></span><br><span class="line">        ...mapActions(&#123;</span><br><span class="line">        	<span class="attr">incrementNum</span>:<span class="string">&#x27;incrementAsync&#x27;</span>,	<span class="comment">//可以通过this.incrementNum()来调用</span></span><br><span class="line">    	&#125;)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>

<h3 id="Module"><a href="#Module" class="headerlink" title="Module"></a>Module</h3><p>讲store分割成多个module，便于管理与调用</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> moduleA=&#123;</span><br><span class="line">    <span class="function"><span class="title">state</span>(<span class="params"></span>)</span>&#123;&#125;,</span><br><span class="line">    <span class="attr">getters</span>:&#123;&#125;,</span><br><span class="line">    <span class="attr">mutations</span>:&#123;&#125;,</span><br><span class="line">    <span class="attr">actions</span>:&#123;&#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">const</span> moduleB=&#123;</span><br><span class="line">    <span class="function"><span class="title">state</span>(<span class="params"></span>)</span>&#123;&#125;,</span><br><span class="line">    <span class="attr">getters</span>:&#123;&#125;,</span><br><span class="line">    <span class="attr">mutations</span>:&#123;&#125;,</span><br><span class="line">    <span class="attr">actions</span>:&#123;&#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">const</span> store = <span class="keyword">new</span> Vuex.Store(&#123;</span><br><span class="line">    <span class="attr">modules</span>:&#123;</span><br><span class="line">        <span class="attr">a</span>:moduleA,</span><br><span class="line">        <span class="attr">b</span>:moduleB</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br><span class="line">store.state.a 	<span class="comment">//moduleA的状态</span></span><br><span class="line">store.state.b	<span class="comment">//moduleB的状态</span></span><br><span class="line"></span><br><span class="line">store.getter.a	<span class="comment">//moduleA的getter</span></span><br></pre></td></tr></table></figure>

<ul>
<li>在module的mutation和getter中，第一个参数state是内部的state</li>
<li>在module的getter中，第一个参数是局部state，第二个参数是其他getter方法的对象，第三个是rootState</li>
<li>在module的action中，context.state是局部状态，context.rootState是根节点状态</li>
</ul>
<blockquote>
<p>默认情况下，模块内部的action、mutation和getter，注册在全局命名空间</p>
</blockquote>
<p>如果需要单独给模块开辟命名空间，可以使用如下选项：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">namespaced:<span class="literal">true</span></span><br></pre></td></tr></table></figure>

<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> store = <span class="keyword">new</span> Vuex.Store(&#123;</span><br><span class="line">    <span class="attr">modules</span>:&#123;</span><br><span class="line">        <span class="attr">moduleA</span>:&#123;</span><br><span class="line">            <span class="attr">namespaced</span>:<span class="literal">true</span>,</span><br><span class="line">            <span class="function"><span class="title">state</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">                <span class="attr">count</span>:<span class="number">0</span>,</span><br><span class="line">            &#125;,</span><br><span class="line">            <span class="attr">getters</span>:&#123;</span><br><span class="line">                <span class="function"><span class="title">gCount</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">                    <span class="comment">// 调用getters[&#x27;moduleA/gCount&#x27;]</span></span><br><span class="line">                &#125;</span><br><span class="line">            &#125;,</span><br><span class="line">            <span class="attr">mutations</span>:&#123;</span><br><span class="line">                <span class="function"><span class="title">increment</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">                    <span class="comment">// 调用commit(&#x27;moduleA/increment&#x27;)</span></span><br><span class="line">                &#125;</span><br><span class="line">            &#125;,</span><br><span class="line">            <span class="attr">actions</span>:&#123;</span><br><span class="line">                <span class="function"><span class="title">incrementAsync</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">                    <span class="comment">// 调用dispath(&#x27;moduleA/increment&#x27;)</span></span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="attr">moduleB</span>:&#123;</span><br><span class="line">            <span class="function"><span class="title">state</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">                <span class="attr">count</span>:<span class="number">0</span>,</span><br><span class="line">            &#125;,</span><br><span class="line">            <span class="attr">getters</span>:&#123;</span><br><span class="line">                <span class="function"><span class="title">gCount</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">                    <span class="comment">// 调用getters[&#x27;gCount&#x27;]</span></span><br><span class="line">                &#125;</span><br><span class="line">            &#125;,</span><br><span class="line">            <span class="attr">mutations</span>:&#123;</span><br><span class="line">                <span class="function"><span class="title">increment</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">                    <span class="comment">// 调用commit(&#x27;increment&#x27;)</span></span><br><span class="line">                &#125;</span><br><span class="line">            &#125;,</span><br><span class="line">            <span class="attr">actions</span>:&#123;</span><br><span class="line">                <span class="function"><span class="title">incrementAsync</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">                    <span class="comment">// 调用dispath(&#x27;incrementAsync&#x27;)</span></span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>


<hr>
<h3 id="项目结构"><a href="#项目结构" class="headerlink" title="项目结构"></a>项目结构</h3><hr>
<p>规则：</p>
<ol>
<li>状态应集中在一个store对象中</li>
<li>mutation是唯一的改变state的方法，只能是同步</li>
<li>异步都应该在action中</li>
</ol>
<blockquote>
<p>在大型项目中，可以将action、mutation、getter分离到单独文件</p>
</blockquote>
<hr>
<h3 id="插件"><a href="#插件" class="headerlink" title="插件"></a>插件</h3><hr>
<blockquote>
<p>什么是插件？</p>
</blockquote>
<blockquote>
<p>理解1：</p>
</blockquote>
<ul>
<li>plugin在每次mutation后执行，由于mutation操作state的变化，但是不能记录变化。所以可以使用plugin来充当日志</li>
</ul>
<blockquote>
<p>使用<code>subscribe(mutation,state)</code>来编写插件逻辑代码</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> myPlugin = <span class="function">(<span class="params">store</span>)=&gt;</span>&#123;</span><br><span class="line">    store.subscribe(<span class="function">(<span class="params">mutation,state</span>)=&gt;</span>&#123;</span><br><span class="line">        <span class="comment">// 在每次mutation之后调用</span></span><br><span class="line">        <span class="comment">// mutation的格式为&#123; type , payload &#125;</span></span><br><span class="line">    &#125;)</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">const</span> store = <span class="keyword">new</span> Vuex.Store(&#123;</span><br><span class="line">    <span class="attr">plugins</span>:[myPlugin]</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>

<hr>
<h3 id="严格模式"><a href="#严格模式" class="headerlink" title="严格模式"></a>严格模式</h3><hr>
<blockquote>
<p>开启严格模式后，只能由mutation函数修改state，不然会抛出错误</p>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> store = <span class="keyword">new</span> Vuex.Store(&#123;</span><br><span class="line">    <span class="attr">strict</span>:<span class="literal">true</span>,</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<blockquote>
<p>不要再发布环境使用严格模式，会损失性能。</p>
</blockquote>
<hr>
<h3 id="表单处理"><a href="#表单处理" class="headerlink" title="表单处理"></a>表单处理</h3><hr>
<blockquote>
<p>表单常常用<code>v-model</code>来绑定数据，对于严格模式下的vuex，数据的修改只能通过mutation，所以会产生矛盾</p>
</blockquote>
<blockquote>
<p>解决办法：从<code>v-model</code>的原理入手：<code>v-model</code>=<code>@input</code>+<code>:value</code></p>
</blockquote>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">&#x27;text&#x27;</span> <span class="attr">:value</span>=<span class="string">&#x27;message&#x27;</span> @<span class="attr">input</span>=<span class="string">&#x27;updateMessage&#x27;</span>&gt;</span></span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> store = <span class="keyword">new</span> Vuex.Store(&#123;</span><br><span class="line">    <span class="attr">strict</span>:<span class="literal">true</span>,</span><br><span class="line">    <span class="attr">state</span>:&#123;</span><br><span class="line">        <span class="attr">message</span>:<span class="string">&quot;this is a message first&quot;</span></span><br><span class="line">    &#125;,</span><br><span class="line">    <span class="attr">mutations</span>:&#123;</span><br><span class="line">        <span class="function"><span class="title">updateMessage</span>(<span class="params">state,payload</span>)</span>&#123;</span><br><span class="line">            state.message = payload.newMessage;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br><span class="line"><span class="keyword">const</span> app = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">    <span class="attr">store</span>:store,</span><br><span class="line">    <span class="attr">template</span>:<span class="string">`</span></span><br><span class="line"><span class="string">    &lt;div&gt;</span></span><br><span class="line"><span class="string">        &lt;input type=&#x27;text&#x27; :value=&#x27;message&#x27; @input=&#x27;updateMessage&#x27;&gt;</span></span><br><span class="line"><span class="string">        &lt;p&gt;&#123;&#123;this.message&#125;&#125;&lt;/p&gt;</span></span><br><span class="line"><span class="string">    &lt;/div&gt;</span></span><br><span class="line"><span class="string">    `</span></span><br><span class="line">    <span class="attr">computed</span>:&#123;</span><br><span class="line">        ...mapState(&#123;</span><br><span class="line">            <span class="attr">message</span> : <span class="function"><span class="params">state</span> =&gt;</span> state.moduleA.message</span><br><span class="line">        &#125;)</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="attr">methods</span>:&#123;</span><br><span class="line">        <span class="function"><span class="title">updateMessage</span>(<span class="params">e</span>)</span>&#123;</span><br><span class="line">            <span class="built_in">this</span>.$store.commit(&#123;</span><br><span class="line">                <span class="attr">type</span>:<span class="string">&#x27;updateMessage&#x27;</span>,</span><br><span class="line">                <span class="attr">newMessage</span>:e.target.value,</span><br><span class="line">            &#125;);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
 
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